Remove `GLIBC_TUNABLES` from `hulk.service`

[schmidma]

meta-nao/meta-hulks/recipes-hulks/hulk/hulk/hulk.service

Line 10 in a41dfa5

Environment="GLIBC_TUNABLES=glibc.rtld.execstack=2"

specifies to allow executable stack, as openvino requires that.

In a recent patch: intel/meta-openvino@e463d78 this should be fixed.

We might be able to upgrade and removed the GLIBC_TUNABLES